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Bythotrephes longimanus

Biological Category 
Aquatic Invertebrate
Species Type 
Aquatic Invasives
LHPrism Status 
Tier 1 - Threat
Key Characteristics 
Clear, gelatinous with tiny black spots
Extremely small and difficult to see individually. Can measure 1/4 to 5/8 of an inch.
Small spikes line the tail and legs.
Form dense clusters that can feel like cotton or gelatin

Vertical Tabs

Impacts of this species 

Spiny waterflea consumes zooplankton, a vital food source for native fish and crustaceans. It can also cluster on fishing lines and clog pole eyelets.